Look at your fingernails right now. If you see vertical ridges, white spots, or they’re brittle and peeling, you’re severely deficient in the vitamins preventing dementia. Here’s what to look for.Your nails are a direct window into your nutrient status. The same deficiencies causing nail problems are starving your brain and causing memory loss, confusion, and cognitive decline.Here are the 5 nail signs showing dangerous vitamin deficiencies:Number 1 – Vertical ridges mean B vitamin deficiency, e